Richard Broersma Jr wrote:
>> id id_1 id_2 date_time
>> 1 101 1000 2006-07-04 11:25:43
>> I want to find all records have same id_1, but different id_2 and
have
>> difference in time less than 5 minutes.
>> In this case this is record 1 and record 3.
>> How can I do this ?
>
> I am sure that this will need some "tuning" to get it to work
> correctly but should give you one
> way to get what you want.
>
> select a.id, a.id_1, a.id_2, a.date_time
>
> from table1 a join table1 b on (a.id_1 = b.id_1)
> where
> a.id_2 != b.id_2
> and
> abs( a.date_time - b.date_time) < ' 5 minutes'
> ;
... maybe use 'a.id_2 < b.id_2' if you want to exclude double results.
Yours,
Laurenz Albe
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
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